Bill,
Do you remember what alternator you replaced and what the new one is?
I originally had a Powermaster 17078 (Ford 1 wire, 55A @ idle) with a Powermaster 8-37141 (Ford 1 wire, 100A @ idle).
I upgraded the alt because I had a charging issue and prematurely killed my battery due to a bigger SPAL fan.
I wonder now about the light if I had started with the bigger alt? Guess I could always reconnect the wire and find out
